| 白光有机电致发光器件的载流子传输与复合特性 |
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| 引用本文： | 黄荣娟,魏梦杰,郭坤平,景悦林,张浩,魏斌,蔡苗.白光有机电致发光器件的载流子传输与复合特性[J].强激光与粒子束,2015,27(2):024152. |
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| 作者姓名： | 黄荣娟 魏梦杰 郭坤平 景悦林 张浩 魏斌 蔡苗 |
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| 作者单位： | 1.上海大学 材料科学与工程学院, 上海 200072; |
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| 摘 要： | 基于一种将具有电荷传输性的双极性主体材料与蓝、黄光客体材料共蒸的单层结构的同质结结构，制备了色温可调的白光有机电致发光器件(OLED)。由于不存在激子阻挡层，单层结构容易发生漏电流现象，致使OLED器件具有较高的工作电压和较低的电流/功率效率。在空穴/电子传输层进行p/n型掺杂的同质结结构则大大改善了器件性能。研究表明: 该种器件结构获得了相对较低的起压5.6 V，较高的电流效率2.64 cd/A和低效率滚降，其色坐标则随着亮度的增加沿着普朗克轨迹变化，产生类似于太阳光的发光特性。另外，对主体材料和共蒸层的电荷载流子的传输特性和复合机制也进行了一系列分析研究。
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| 关 键 词： | 有机电致发光 同质结结构 色温可调白色光器件 效率滚降 |
| 收稿时间： | 2014-09-17 |
Carrier transport and recombination of white organic light-emitting diodes |
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| Institution: | 1.School of Material Science and Engineering,Shanghai University,Shanghai 200072,China;2.Key Laboratory of Advanced Display and System Applications of Ministry of Education,Shanghai University,Shanghai 200072,China;3.School of Mechanical &Electrical Engineering,Guilin University of Electronic Technology,Guilin 541004,China |
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| Abstract: | Homojunction structure involved p/n-doped layers in the organic charge transport layers of organic light-emitting diodes (OLEDs) was developed to achieve chromaticity-tunable white OLEDs. This structure based on a single-layer structure which had a bipolar host material and co-dopant of complementary blue and yellow emitters, A relatively low turn-on voltage of 5.6 V, a high current efficiency of 2.64 cd/A and a low efficiency roll-off were achieved. Moreover, the Commission Internationale dEclairage coordinates varied from (0.41, 0.43) to (0.32, 0.35), which shifted almost along with the Planckian locus as the luminance increased. In addition, the charge carrier transport properties and recombination mechanisms were investigated and analyzed. |
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